Boat.



Y PATENTED JULY 23,1907.

W. J. NOLAN.

BOAT.

APPLICATION FILED JAN. 7, 1901.

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THE NUR IS F. N D C PATENTED JULY 23, 1907.

W. J. NOLAN.

No. 861,045. r

BOAT.

APPLIOATION FILED JAN. 7, 1901.

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WILLIAM J. NOLAN, OF ST. LOUIS, MISSOURI.

BOAT.

Specification of Letters Patent.

Patented July 23, 1907.

Application filed January 7,1907. Serial No. 351,166.

To all whom it may concern:

Be it known that 1, WILLIAM J. NOLAN, a citizen of the United States, residing at St. Louis, in the State of Missouri, have invented new and useful Improvements in Boats, of which the following is a specification.

This invention relates to boats, and one of the principal objects of the same is to provide means whereby the boat may be readily adjusted to draw more or less water.

Another object of the invention is to provide a boat with an inner and outer hull and to provide means for raising and lowering the inner hull in order that the boat may be used for deep or shallow water.

Still another object of my invention is to provide a plurality of propeller wheels arranged in horizontal alinement in a different plane upon the outer hull of a double-hulled boat.

These and other objects may be attained by means of the construction illustrated in the accompanying drawings, in which 2- Figure l is a side elevation of a boat made in accordance with my invention and showing the inner hull raised to permit the boat to move in shallow water. Fig. 2 is a plan view of the same. Fig. 3 is a transverse sectional view of the boat with the inner hull lowered. Fig. 4 is a similar view with the inner hull raised. Fig. 5 is a detail, sectional view of the stern end of the boat showing the barrels for the rudder shaft telescoped.

Referring to the drawings for a more particular description of my invention, the numeral 1 designates the outer hull and 2 the inner hull. The outer hull comprises two hollow side portions 3 provided with a curved inner wall and the inner hull is provided with a keel 5 and a deck portion 6, said inner hull adapted to fit the space between the two side portions of the hull 1. The inner hull is adapted to be raised and lowered relatively to the outer hull and the means for raising and lowering said inner hull may consist of piston rods 7 connected to projecting portions 8 of said inner hull and extended down into a cylinder 9 dis posed within the outer hull. The piston heads upon the rods 7 may be operated by hydraulic or other power for raising and lowering the inner hull 2. For guiding the inner hull in its movements rods 10 pass through the skin of the inner hull and through bearings 11 formed on the inner wall of said skin, the shaft 10 being surrounded by a spring 12 which bears against collars 13 on said shaft 10 to move said shaft outward, as will be understood. On the outer ends of the shaft 10 rollers 14 are journaled, said rollers moving in guideways 15 on the inner walls of the outer section 1, said rollers being held within the guideways 15 by means of the springs 12. Any suitable number of rods and springs may be utilized, three being shown upon each side of the inner hull in Figs. 1 and 2. In order that the hull 2 may be held in its adjusted position relatively to the outer hull, 'a series of clamps 16 consisting of double pointed levers pivotally connected to the pintles of the rollers 14 are provided, the pointed ends of said clamps adapted to engage the eyes or keepers 17 secured to the curved walls 4 of the outer hull. When the inner hull 2 is raised the upwardly extending points of the clamps 16 engage the eyes or keepers 17 secured to the curved walls 4 of the outer hull, while the downwardly extending points of the clamps bear against the surface of the curved walls 4 under the stress of spring 12.

The rudder 18 is mounted upon a shaft 19, the upper end of which passes through a barrel or cylinder 20, said cylinder being mounted to slide in a sleeve 21 connected to the outer hull and mounted to slide in a slot 22 in the stern post 23. This arrangement permits the rudder to be used when the inner hull is either in its raised or lowered position.

As shown in Fig. 1, three propeller wheels 24 are mounted upon each side of the outer hull in the same horizontal plane and arnnged in parallel vertical planes. The purpose of this arrangement is to attain increased speed. c

From the foregoing it will be obvious that a boat made in accordance with my invention may be used in both shallow and deep water and that when the inner hull is lowered to the position shown in Fig. 3 there is a central keel extending from end to end of the boat and that when the inner hull is raised in the position shown in Fig. 4 it forms substantially a fiat-bottom boat havng a central well and will in this way draw but little water. The inner hull may be quickly raised or lowered by hydraulic or other means and will work easily owing to the rollers 14 reducing the friction between the two hulls.

Various changes in the details of construction may be resorted to without departing from the spirit and scope of my invention.

Having thus described my invention, what I claim is:-

1. A boat comprising an outer hull and an inner hull, said inner hull mounted to move vertically witlrrelation to the outer hull and provided with yieldingly mounted rollers and springs for holding the said rollers in contact with the outer hull.

2. A boat comprising an outer hull, an' inner hull mounted to move vertically within the outer hull, rods mounted to move within the inner hull, antifriction rollers secured to said rods, springs connected to the inner ends of said rods, and clamps carried by said rollers designed to engage eyes or keepers, and means for raising and lowering said inner hull.

3. A boat comprising a hollow outer hull, a hollow inner hull, means for raising and lowering said inner hull a sleeve through which said cylinder -is mounted to slide, 10 relative to the outer hull, antifriction rollers yieldingly said sleeve being movable in a slot in the stern post, submounted upon the inner hull, guideways for said rollers stantially as described.

on the outer hull, and clamps carried by the rollers. In testimony whereof, I atiix my signature in presence 4. A boat comprising an outer hull, a vertically movable of two witnesses.

inner hull, means for moving, said inner hull relatively to WILLIAM J. NOLAN.

the outer hull, means for securing said inner hull in Witnesses:

adjusted position, a rudder, a shaft connected to said B. J. OREILEY,

rudder, said shaft passing through the barrel or cylinder, R. C. LINDSAY. 

